Josh Clark is a designer specializing in mobile strategy and user experience. He’s author of Tapworthy: Designing Great iPhone Apps (O’Reilly, 2010) and Best iPhone Apps (O’Reilly, 2009). He founded and leads Global Moxie, which offers design services and strategic advice to help media companies, design agencies, and creative organizations build tapworthy mobile apps and effective websites. Global Moxie’s clients include Time Inc., eBay, Nokia, and Intuit, among others.

Before the internet swallowed him up, Josh was a management consultant at Monitor Group in Cambridge, Mass, and before that, a producer of national PBS programs at Boston’s WGBH. He shared his three words of Russian with Mikhail Gorbachev, strolled the ranch with Nancy Reagan, hobnobbed with Rockefellers, and wrote trivia questions for a primetime game show. In 1996, he created the uberpopular Couch-to-5K (C25K) running program, which has helped millions of skeptical would-be exercisers take up jogging. (His motto is the same for fitness as it is for software user experience: no pain, no pain.)